Prewashing sink for washing machine



1. Prewashing sink for washing machine

1.1 is a perspective view of a prewashing sink for washing machine showing our new design;

1.2 is a front elevation view thereof;

1.3 is a rear elevation view thereof;

1.4 is a left-side elevation view thereof;

1.5 is a right-side elevation view thereof;

1.6 is a top plan view thereof;

1.7 is a bottom plan view thereof; and

1.8 is a perspective view thereof in a use condition.

The broken lines in Figure 1.8 illustrating portions of the washing machine form no part of the claimed design. 

CLAIM The ornamental design for a prewashing sink for washing machine, as shown and described. 